★pat sb/yourself on the back
LONGMAN'ｓ definition ⇒praise someone or feel pleased with yourself for diong something well (ex.)She should pat herself on the back and take a well-earned break.
China, still patting itself on the back after a hugely successful Olympics, will launch a three-man space flight this month, with all system already in final preparation.
(北京）五輪の大成功をいまだに自画自賛している中国は今月、3人乗りの宇宙船を打ち上げるが、すべてのシステムは既に最終的な準備段階にある。
◆pat oneself on the back ： 得意になる、自画自賛する